Channel detection notification method, apparatus and base station

Abstract

Provided is a channel detection notification method when a LTE system works at an unauthorized frequency band, a system and a base station. The channel detection notification method includes the follows. A primary cell base station receives RRM measuring results of multiple base stations at the unauthorized frequency band reported by a terminal; according to the RRM measuring results of the multiple base stations, a secondary cell base station is selected for the terminal; if it is determined that downlink traffic reaches a set first traffic threshold value, the secondary cell base station is informed to conduct downlink channel detection at the unauthorized frequency band; and if it is determined that uplink traffic reaches a set second traffic threshold value, the secondary cell base station and/or the terminal is informed to conduct uplink channel detection at the unauthorized frequency band.

What is claimed is: 
     
       1. A method for channel detection notification for a base station, comprising:
 when a LTE system works at an unauthorized frequency band, receiving, by a primary cell base station, Radio Resource Management (RRM) measuring results of multiple base stations at the unauthorized frequency band reported by a terminal; 
 selecting a secondary cell base station for the terminal according to the RRM measuring results of the multiple base stations; 
 informing the secondary cell base station to conduct downlink channel detection at the unauthorized frequency band, when it is determined that downlink traffic reaches a set first traffic threshold value; and 
 informing at least one of the secondary cell base station and the terminal to conduct uplink channel detection at the unauthorized frequency band, when it is determined that uplink traffic reaches a set second traffic threshold value. 
 
     
     
       2. The method of  claim 1 , wherein informing at least one of the secondary cell base station and the terminal to conduct the uplink channel detection at the unauthorized frequency band comprises:
 informing at least one of the secondary cell base station and the terminal to repeat channel detection at a fixed period at the unauthorized frequency band; or 
 informing at least one of the secondary cell base station and the terminal to repeat the channel detection at the unauthorized frequency band when receiving traffic to be transmitted. 
 
     
     
       3. The method of  claim 2 , further comprising:
 after choosing the secondary cell base station for the terminal and prior to informing at least one of the secondary cell base station and the terminal to conduct the channel detection, sending an adding instruction of the secondary cell base station to the terminal, wherein the terminal is informed that communication service is provided by the secondary cell base station. 
 
     
     
       4. The method of  claim 3 , wherein
 when at least one of the secondary cell base station and the terminal are informed to repeat the channel detection at the fixed period at the unauthorized frequency band, the adding instruction comprises a start time of the channel detection of at least one of the secondary cell base station and the terminal, and at least three of the following parameters: a channel detection duration, a channel detection period, a maximum channel occupancy time, and an idle time; or 
 when at least one of the secondary cell base station and the terminal is informed to conduct the channel detection at the unauthorized frequency band when receiving the traffic to be transmitted, the adding instruction comprises the channel detection duration and a random number wherein
 at least one of the secondary cell base station and the terminal chooses the random number when the channel is detected busy, 
 when the channel is detected busy in the following detection, the value of the random number is configured to be remain unchanged, and 
 when the channel is detected idle, the value of the random number is decreased by 1 and transmitted until the value of the random number is 0. 
 
 
     
     
       5. The method of  claim 2 , wherein informing the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection at the unauthorized frequency band comprises:
 informing the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection via an interface between the primary cell base station and the secondary cell base station. 
 
     
     
       6. The method of  claim 1 , further comprising:
 when at least one of a scheduling request and a buffer status report sent by the terminal are received, determining whether uplink traffic of an activated service cell of the terminal reaches a second traffic threshold value. 
 
     
     
       7. The method of  claim 1 , further comprising:
 after informing the secondary cell base station to conduct the downlink channel detection at the unauthorized frequency band, sending activation signaling of the secondary cell base station to the terminal, wherein after receiving the activation signaling, the terminal monitors a physical downlink control channel of the secondary cell base station, a physical downlink shared channel of the secondary cell base station, and a reference signal sent by the secondary cell base station, and measures channel state information of the secondary cell base station; and 
 after informing the secondary cell base station to conduct the uplink channel detection at the unauthorized frequency band, sending the activation signaling of the secondary cell base station to the terminal, wherein after receiving the activation signaling, the terminal sends a probe reference signal. 
 
     
     
       8. The method of  claim 1 , wherein informing the terminal to conduct the uplink channel detection at the unauthorized frequency band comprises:
 detecting whether the downlink channel of the secondary cell base station is idle; and 
 when it is detected that the downlink channel of the secondary cell base station is idle, sending a downlink reference signal through the secondary cell base station, and informing the terminal to conduct the uplink channel detection at the unauthorized frequency band. 
 
     
     
       9. The method of  claim 8 , wherein informing the terminal to conduct the uplink channel detection at the unauthorized frequency band comprises one of:
 informing the terminal to conduct the uplink channel detection via activation signaling implicitly, and informing the terminal to stop the uplink channel detection via deactivation signaling implicitly; 
 informing the terminal to conduct the uplink channel detection via uplink grant signaling sent to the terminal implicitly; 
 determining new media access layer control signaling comprising multiple indicator bits to inform the terminal to conduct the uplink channel detection, wherein each indicator bit of the multiple indicator bits corresponds to one secondary cell base station, and each indicator bit is used for indicating whether the terminal needs to conduct the uplink channel detection on the secondary cell base station corresponding to each indicator bit; and 
 determining new physical downlink control signaling to inform the terminal to conduct the uplink channel detection on a specified secondary cell base station. 
 
     
     
       10. The method of  claim 1 , wherein informing the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection at the unauthorized frequency band comprises:
 informing the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection via an interface between the primary cell base station and the secondary cell base station. 
 
     
     
       11. An apparatus for channel detection notification for a base station, comprising:
 a memory configured to store program codes; and 
 at least one processor, wherein, when executed by the at least one processor, the program codes are configured to cause the at least one processor to: 
 when a LTE system works at an unauthorized frequency band, receive, by a primary cell base station, Radio Resource Management (RRM) measuring results of multiple base stations at the unauthorized frequency band reported by a terminal; 
 select a secondary cell base station for the terminal according to the RRM measuring results of the multiple base stations; 
 inform the secondary cell base station to conduct downlink channel detection at the unauthorized frequency band, when it is determined that downlink traffic reaches a set first traffic threshold value; and 
 inform at least one of the secondary cell base station and the terminal to conduct uplink channel detection at the unauthorized frequency band, when it is determined that uplink traffic reaches a set second traffic threshold value. 
 
     
     
       12. The apparatus of  claim 11 , wherein the program codes to inform at least one of the secondary cell base station and the terminal to conduct the uplink channel detection at the unauthorized frequency band further comprise program codes to:
 inform at least one of the secondary cell base station and the terminal to repeat channel detection at a fixed period at the unauthorized frequency band; or 
 inform at least one of the secondary cell base station and the terminal to repeat the channel detection at the unauthorized frequency band when receiving traffic to be transmitted. 
 
     
     
       13. The apparatus of  claim 12 , wherein the memory further comprises program codes which when executed by the at least one processor causes the at least one processor to:
 after choosing the secondary cell base station for the terminal and prior to informing at least one of the secondary cell base station and the terminal to conduct the channel detection, send an adding instruction of the secondary cell base station to the terminal, wherein the terminal is informed that communication service is provided by the secondary cell base station. 
 
     
     
       14. The apparatus of  claim 13 , wherein
 when at least one of the secondary cell base station and the terminal are informed to repeat the channel detection at the fixed period at the unauthorized frequency band, the adding instruction comprises a start time of the channel detection of at least one of the secondary cell base station and the terminal and at least three of the following parameters: a channel detection duration, a channel detection period, a maximum channel occupancy time, and an idle time; or 
 when at least one of the secondary cell base station and the terminal is informed to conduct the channel detection at the unauthorized frequency band when receiving the traffic to be transmitted, the adding instruction comprises the channel detection duration and a random number, further wherein
 at least one of the secondary cell base station and the terminal chooses the random number when the channel is detected busy, 
 when the channel is detected busy in the following detection, the value of the random number is configured to be remain unchanged, and 
 when the channel is detected idle, the random number is decreased by 1 and transmitted until the value of the random number is 0. 
 
 
     
     
       15. The apparatus of  claim 11 , wherein the memory further comprises program codes which when executed by the at least one processor causes the at least one processor to:
 when at least one of a scheduling request and a buffer status report sent by the terminal are received, determine whether uplink traffic of an activated service cell of the terminal reaches a second traffic threshold value. 
 
     
     
       16. The apparatus of  claim 11 , wherein the memory further comprises program codes which when executed by the at least one processor causes the at least one processor to:
 after informing the secondary cell base station to conduct the downlink channel detection at the unauthorized frequency band, send activation signaling of the secondary cell base station to the terminal, wherein after receiving the activation signaling, the terminal monitors a physical downlink control channel of the secondary cell base station, a physical downlink shared channel of the secondary cell base station, and a reference signal sent by the secondary cell base station and measures channel state information of the secondary cell base station; and 
 after informing the secondary cell base station to conduct the uplink channel detection at the unauthorized frequency band, send the activation signaling of the secondary cell base station to the terminal, wherein after receiving the activation signaling, the terminal sends a probe reference signal. 
 
     
     
       17. The apparatus of  claim 11 , wherein the program codes to inform the terminal to conduct the uplink channel detection at the unauthorized frequency band further comprise program codes to:
 detect whether the downlink channel of the secondary cell base station is idle; and 
 when it is detected that the downlink channel of the secondary cell base station is idle, send a downlink reference signal through the secondary cell base station, and inform the terminal to conduct the uplink channel detection at the unauthorized frequency band. 
 
     
     
       18. The apparatus of  claim 17 , wherein the program codes to inform the terminal to conduct the uplink channel detection at the unauthorized frequency band further comprise program codes to perform one of:
 informing the terminal to conduct the uplink channel detection via activation signaling implicitly, and inform the terminal to stop the uplink channel detection via deactivation signaling implicitly; 
 informing the terminal to conduct the uplink channel detection via uplink grant signaling sent to the terminal implicitly; 
 determining new media access layer control signaling comprising multiple indicator bits to inform the terminal to conduct the uplink channel detection, wherein each indicator bit of the multiple indicator bits corresponds to one secondary cell base station, and each indicator bit is used for indicating whether the terminal needs to conduct the uplink channel detection on the secondary cell base station corresponding to each indicator bit; and 
 determining new physical downlink control signaling to inform the terminal to conduct the uplink channel detection on a specified secondary cell base station. 
 
     
     
       19. The apparatus of  claim 11 , wherein the program codes to inform the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection at the unauthorized frequency band further comprise program codes to:
 inform the secondary cell base station to conduct at least one of the uplink channel detection and the downlink channel detection via an interface between the primary cell base station and the secondary cell base station. 
 
     
     
       20. A base station, comprising a channel detection notification apparatus, wherein the channel detection notification apparatus comprises:
 a memory configured to store program codes; and 
 at least one processor, wherein, when executed by the at least one processor, the program codes are configured to cause the at least one processor to: 
 when a LTE system works at an unauthorized frequency band, receive, by a primary cell base station, Radio Resource Management (RRM) measuring results of multiple base stations at the unauthorized frequency band reported by a terminal; 
 select a secondary cell base station for the terminal according to the RRM measuring results of the multiple base stations; 
 inform the secondary cell base station to conduct downlink channel detection at the unauthorized frequency band, when it is determined that downlink traffic reaches a set first traffic threshold value; and 
 inform at least one of the secondary cell base station and the terminal to conduct uplink channel detection at the unauthorized frequency band, when it is determined that uplink traffic reaches a set second traffic threshold value.